I need to re-orient some old propane tank fittings (guage, solenoid, etc) on a new propane tank added to my boats aft rail. Some of the fittings seem to have teflon tape on the threads and some don't. Using teflon tape might help to get a tight fit in the new orientation.Is it OK to use teflon tape or anything else on brass propane connections?Thanks for any help.